﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Security;

namespace CS795.TravelAgency.Infrastructure
{
    public class CustomMembershipProvider : MembershipProvider
    {
        private Domain.TravelAgencyContext context = new Domain.TravelAgencyContext();

        private string m_ApplicationName;
        public override string ApplicationName
        {
            get
            {
                return m_ApplicationName;
            }
            set
            {
                m_ApplicationName = value;
            }
        }

        public override bool ValidateUser(string username, string password)
        {
            Domain.Entities.User user = context.Users.Where(u => u.Name == username).SingleOrDefault();
            if (user != null)
            {
                string hash = GenerateHash(user.Salt, password);
                if (user.Password == hash)
                {
                    return true;
                }
            }
            return false;
        }

        public override bool ChangePassword(string username, string oldPassword, string newPassword)
        {
            Domain.Entities.User user = context.Users.Where(u => u.Name == username).SingleOrDefault();
            if (user != null)
            {
                string oldHash = GenerateHash(user.Salt, oldPassword);
                if (user.Password == oldHash)
                {
                    string newHash = GenerateHash(user.Salt, newPassword);
                    user.Password = newHash;
                    context.SaveChanges();
                    return true;
                }
            }
            return false;
        }

        public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status)
        {
            MembershipUser result = null;
            Domain.Entities.User user = context.Users.Where(u => u.Name == username).SingleOrDefault();
            Domain.Entities.Role customerRole = context.Roles.Where(r => r.Name == "Customers").Single();
            if (user == null)
            {
                user = new Domain.Entities.User
                {
                    Name = username,
                    Email = email,
                    Salt = "123456",
                    Password = GenerateHash("123456", password),
                    Roles = (new[] { customerRole }).ToList()
                };
                context.Users.Add(user);
                context.SaveChanges();
                result = new MembershipUser("CustomMembershipProvider", username, null, email, null, null, true, false, DateTime.Now, DateTime.Now, DateTime.Now, DateTime.Now, DateTime.MinValue);
                status = MembershipCreateStatus.Success;
            }
            else
            {
                status = MembershipCreateStatus.DuplicateUserName;
            }
            return result;
        }

        #region Not Implemented Functions
        public override bool ChangePasswordQuestionAndAnswer(string username, string password, string newPasswordQuestion, string newPasswordAnswer)
        {
            throw new NotImplementedException();
        }

        public override bool DeleteUser(string username, bool deleteAllRelatedData)
        {
            throw new NotImplementedException();
        }

        public override bool EnablePasswordReset
        {
            get { throw new NotImplementedException(); }
        }

        public override bool EnablePasswordRetrieval
        {
            get { throw new NotImplementedException(); }
        }

        public override MembershipUserCollection FindUsersByEmail(string emailToMatch, int pageIndex, int pageSize, out int totalRecords)
        {
            throw new NotImplementedException();
        }

        public override MembershipUserCollection FindUsersByName(string usernameToMatch, int pageIndex, int pageSize, out int totalRecords)
        {
            throw new NotImplementedException();
        }

        public override MembershipUserCollection GetAllUsers(int pageIndex, int pageSize, out int totalRecords)
        {
            throw new NotImplementedException();
        }

        public override int GetNumberOfUsersOnline()
        {
            throw new NotImplementedException();
        }

        public override string GetPassword(string username, string answer)
        {
            throw new NotImplementedException();
        }

        public override MembershipUser GetUser(string username, bool userIsOnline)
        {
            throw new NotImplementedException();
        }

        public override MembershipUser GetUser(object providerUserKey, bool userIsOnline)
        {
            throw new NotImplementedException();
        }

        public override string GetUserNameByEmail(string email)
        {
            throw new NotImplementedException();
        }

        public override int MaxInvalidPasswordAttempts
        {
            get { throw new NotImplementedException(); }
        }

        public override int MinRequiredNonAlphanumericCharacters
        {
            get { throw new NotImplementedException(); }
        }

        public override int MinRequiredPasswordLength
        {
            get { throw new NotImplementedException(); }
        }

        public override int PasswordAttemptWindow
        {
            get { throw new NotImplementedException(); }
        }

        public override MembershipPasswordFormat PasswordFormat
        {
            get { throw new NotImplementedException(); }
        }

        public override string PasswordStrengthRegularExpression
        {
            get { throw new NotImplementedException(); }
        }

        public override bool RequiresQuestionAndAnswer
        {
            get { throw new NotImplementedException(); }
        }

        public override bool RequiresUniqueEmail
        {
            get { throw new NotImplementedException(); }
        }

        public override string ResetPassword(string username, string answer)
        {
            throw new NotImplementedException();
        }

        public override bool UnlockUser(string userName)
        {
            throw new NotImplementedException();
        }

        public override void UpdateUser(MembershipUser user)
        {
            throw new NotImplementedException();
        }
        #endregion

        #region Utility Functions
        private string GenerateHash(string salt, string password)
        {
            string saltedPassword = salt + password;
            string result = Convert.ToBase64String(System.Security.Cryptography.SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(saltedPassword)));
            return result;
        }
        #endregion
    }
}